moving origin for "set size ratio"

[Shigeharu T. <sh...@ie...>]

shige 04/03 2006
----------------

There may be no difference between gnuplot-4.0 and cvs version 
for the followings:

 set size 0.3 0.6
 set origin 0.2,0.2
 plot x

But a difference appears when we use the ratio option of 
"set size": 

 set size ratio 1 0.3 0.6
 set origin 0.2,0.2
 plot x

The graph of cvs version is upper than the one of gnuplot-4.0. 
This may be caused by the following code in src/graphics.c 
(rev. 1.181, line 900-915):

    if (current > required) {
        /* too tall */
        int height = plot_bounds.ytop - plot_bounds.ybot;
        plot_bounds.ytop = plot_bounds.ybot + required * 
            (plot_bounds.xright - plot_bounds.xleft);
        height -= (plot_bounds.ytop - plot_bounds.ybot);
        height /= 2;
        plot_bounds.ytop += height;
        plot_bounds.ybot += height;
    } else {
        int width = plot_bounds.xright - plot_bounds.xleft;
        plot_bounds.xright = plot_bounds.xleft + 
           (plot_bounds.ytop - plot_bounds.ybot) / required;
        width -= (plot_bounds.xright - plot_bounds.xleft);
        width /= 2;
        plot_bounds.xright += width;
        plot_bounds.xleft += width;
    }

This may move the left bottom point of the graph even if the 
origin is set at desired point. I think this may cause some
problems when user decides the origin.

+========================================================+
 Shigeharu TAKENO     NIigata Institute of Technology
                       kashiwazaki,Niigata 945-1195 JAPAN
 sh...@ie...   TEL(&FAX): +81-257-22-8161
+========================================================+